Search Result for "greisen": 
Wordnet 3.0

NOUN (1)

1. a granitic rock composed of quartz and mica;


The Collaborative International Dictionary of English v.0.48:

Greisen \Grei"sen\, n. (Min.) A crystalline rock consisting of quarts and mica, common in the tin regions of Cornwall and Saxony. [1913 Webster]
WordNet (r) 3.0 (2006):

greisen n 1: a granitic rock composed of quartz and mica